The company has reached an agreement with an unnamed seller to extend the option period until April 10 in order to allow the completion of its due diligence investigations.
The Sydney-based group announced in December that it had signed a 90-day option agreement with an unnamed US coal company to acquire an existing open cut mining operation in the region.
The coalfields in question were said to supply a specialty low-ash product which is sold to niche markets at an attractive premium.
White Energy holds exclusive licensing for a compaction and hydration coal upgrade process known as binderless coal briquetting, which the company expects to apply to the possible US acquisition.
White said it had already tested coal fines sourced from a mine at the Appalachian location in its BCB demonstration plant in Australia.
Should the deal proceed, White would pay $US21.5 million inclusive of all mine infrastructure, plant and equipment, permits and $200,000 option fee.
The company will also have to replace current security bonds of $7.5 million on settlement of the transaction.
